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Finding the Fourth Proportional to 280,722.90, 387,398.61 and 153,398.49

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Solution

The fourth proportional to 280,722.90, 387,398.61 and 153,398.49 is: 211,690.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,722.90 : 387,398.61 = 153,398.49 : x
  2. Step 2: Convert to fraction form
    280,722.90/387,398.61 = 153,398.49/x
  3. Step 3: Cross multiply
    280,722.90x = 387,398.61 × 153,398.49
  4. Step 4: Simplify right side
    280,722.90x = 59,426,361,802.10
  5. Step 5: Solve for x
    x = 59,426,361,802.10/280,722.90
  6. Step 6: Final answer
    x = 211,690.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.